/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.runners.gaia.translation.wrappers.streaming;



import com.bff.gaia.unified.sdk.coders.Coder;

import com.bff.gaia.unified.sdk.util.CoderUtils;



import java.nio.ByteBuffer;

import java.util.Arrays;

import java.util.Locale;



import static com.bff.gaia.unified.vendor.guava.com.google.common.base.Preconditions.checkNotNull;

import static com.bff.gaia.unified.vendor.guava.com.google.common.base.Preconditions.checkState;



/**

 * Utility functions for dealing with key encoding. Unified requires keys to be compared in binary

 * format. The helpers here ensure that a consistent encoding is used.

 */

class GaiaKeyUtils {



  /** Encodes a key to a byte array wrapped inside a ByteBuffer. */

  static <K> ByteBuffer encodeKey(K key, Coder<K> keyCoder) {

    checkNotNull(keyCoder, "Provided coder must not be null");

    final byte[] keyBytes;

    try {

      keyBytes = CoderUtils.encodeToByteArray(keyCoder, key);

    } catch (Exception e) {

      throw new RuntimeException(String.format(Locale.ENGLISH, "Failed to encode key: %s", key), e);

    }

    return ByteBuffer.wrap(keyBytes);

  }



  /** Decodes a key from a ByteBuffer containing a byte array. */

  static <K> K decodeKey(ByteBuffer byteBuffer, Coder<K> keyCoder) {

    checkNotNull(byteBuffer, "Provided ByteBuffer must not be null");

    checkNotNull(keyCoder, "Provided coder must not be null");

    checkState(byteBuffer.hasArray(), "ByteBuffer key must contain an array.");

    @SuppressWarnings("ByteBufferBackingArray")

    final byte[] keyBytes = byteBuffer.array();

    try {

      return CoderUtils.decodeFromByteArray(keyCoder, keyBytes);

    } catch (Exception e) {

      throw new RuntimeException(

          String.format(

              Locale.ENGLISH, "Failed to decode encoded key: %s", Arrays.toString(keyBytes)),

          e);

    }

  }

}